The least progress has been made on reducing ground-level ozone of the six major pollutants tracked by the EPA.

Name: The least progress has been made on reducing ground-level ozone of the six major pollutants tracked by the EPA.
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Ground-level ozone remains a challenging pollutant to control and has seen the least progress among the six major pollutants tracked by the EPA, due to its complex formation process involving sunlight and emissions from various sources.

The Least Progress Has Been Made on Reducing Ground-Level Ozone